Paul Manafort reportedly being investigated for possible money laundering by US attorney's office in New York

The US attorney's office for the Southern District of New York is reportedly investigating President Donald Trump's former campaign chairman Paul Manafort for possible money laundering.

The list of probes against Manafort continues to grow amid special counsel Robert Mueller's own far-reaching investigation into the Trump campaign's ties to Russian operatives.

The US attorney's office in New York has taken up an investigation into President Donald Trump's former campaign chairman, Paul Manafort, for possible money laundering, according to three sources cited in a Wall Street Journal report on Tuesday.

The office was reportedly working in conjunction with special counsel Robert Mueller's own money laundering probe, which has focused on Manafort's business connections with wealthy Russian operatives who have close ties to Russian President Vladimir Putin. The investigation is part of a wider examination of Russia's meddling in the 2016 US presidential election, The Journal reported.

Manafort has not been formally accused of any criminal wrongdoing, and has previously denied the same. His spokesperson was not immediately available for comment.

Republican presidential nominee Donald Trump gives a thumbs up as his campaign manager Paul Manafort (C) and daughter Ivanka (R) look on during Trump's walk through at the Republican National Convention in Cleveland, U.S., July 21, 2016. REUTERS/Rick Wilking

Republican U.S. presidential candidate Donald Trump's campaign manager Paul Manafort talks to the media from the Trump family box on the floor of the Republican National Convention in Cleveland, Ohio, U.S. July 18, 2016. REUTERS/Jonathan Ernst

Paul Manafort, senior advisor to Republican U.S. presidential candidate Donald Trump, smiles as he talks with other Trump campaign staff after Trump spoke to supporters following the results of the Indiana state primary, at Trump Tower in Manhattan, New York, U.S., May 3, 2016. REUTERS/Lucas Jackson

UNITED STATES - JULY 20: A man with a security credential takes a selfie at the podium as Donald Trump, flanked by campaign manager Paul Manafort and daughter Ivanka, checks the podium early Thursday afternoon in preparation for accepting the GOP nomination to be President at the 2016 Republican National Convention in Cleveland, Ohio on Wednesday July 20, 2016. (Photo By Bill Clark/CQ Roll Call)

UNITED STATES - JULY 19: Paul Manafort, advisor to Donald Trump, is seen on the floor of the Quicken Loans Arena at the Republican National Convention in Cleveland, Ohio, July 19, 2016. (Photo By Tom Williams/CQ Roll Call)

NA.R.DoleMicCk1.081596.RG.Republican presidential candidate Bob Dole looks up from podium at balloons and television cameras as convention center manager Paul Manafort, at right, points out preparations for tonight's acceptance speech in San Diego, 08/15/96. (Photo by Robert Gauthier/Los Angeles Times via Getty Images)

News of the probe from the US attorney's office from the Southern District of New York comes amid a Politico report last week that said Trump was interviewing US attorney candidates to head offices for New York's Southern District, based in Manhattan, and Eastern District, based in Brooklyn. Trump was considering nominees who reportedly had ties to his associates, including his personal lawyer, the newspaper said.

"I never heard of a president interviewing a US attorney candidate," Richard Painter, a University of Minnesota law professor who served as Bush's chief ethics lawyer, previously told Business Insider.

The list of probes into Manafort's affairs continues to grow, as prosecutors who specialize in money-laundering cases have recently been recruited to Mueller's team, and investigators continue to ramp up their investigation into Russia's involvement in last year's election.